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Photon-fusion reactions from the chiral Lagrangian with dynamical light vector mesons
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2013 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 73, no 4, 2358- p.Article in journal (Refereed) Published
Abstract [en]

We study the reactions gamma gamma -> pi(0)pi(0), pi(+)pi(-), K-0(K) over bar (0), K+K-, eta eta and pi(0)eta based on a chiral Lagrangian with dynamical light vector mesons as formulated within the hadrogenesis conjecture. At present our chiral Lagrangian contains five unknown parameters that are relevant for the photon-fusion reactions. They parameterize the strength of interaction terms involving two vector meson fields. These parameters are fitted to photon-fusion data gamma gamma -> pi(0)pi(0), pi(+)pi(-), pi(0)eta and to the decay eta -> pi(0)gamma gamma In order to derive gauge invariant reaction amplitudes in the resonance region constraints from maximal analyticity and exact coupled-channel unitarity are used. Our results are in good agreement with the existing experimental data from threshold up to about 0.9 GeV for the two-pion final states. The a(0) meson in the pi(0)eta channel is dynamically generated and an accurate reproduction of the gamma gamma -> pi(0)eta data is achieved up to 1.2 GeV. Based on our parameter sets we predict the gamma gamma -> K-0(K) over bar (0), K+K-, eta eta cross sections.

Place, publisher, year, edition, pages
2013. Vol. 73, no 4, 2358- p.
Keyword [en]
Meson production, Chiral Lagrangians, Vector-meson dominance, Partial-wave analysis, Dispersion relations
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-201264DOI: 10.1140/epjc/s10052-013-2358-1ISI: 000318292200005OAI: oai:DiVA.org:uu-201264DiVA: diva2:626693
Available from: 2013-06-10 Created: 2013-06-10 Last updated: 2017-12-06Bibliographically approved

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Leupold, StefanTerschlusen, Carla

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